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<a class="WebWorks_Breadcrumb_Link" href="Config_Units.6.1.html#1438042">Configuring Units</a> &gt; <a class="WebWorks_Breadcrumb_Link" href="Config_Units.6.16.html#1438042">Changing An Existing Configuration by Migrating</a> &gt; Expanding Unit Capacity</div>
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<div class="Heading2"><a name="1438042">Expanding Unit Capacity</a></div>
<div class="BodyAfterHead"><a name="1438050">You can expand a unit's capacity by adding one or more drives to it without </a>changing the RAID level, except for singles and RAID 1 units. (Since a single can only have one drive, and a RAID 1 can only have two drives, if you add a drive to either, the RAID level must be changed.) </div>
<div class="Body"><a name="1438051">For example, for a RAID 5 with 3 drives, you can change the capacity by </a>adding a forth drive.</div>
<div class="Body"><a name="1112890">Expanding unit capacity can be accomplished while the unit is online, without </a>experiencing any data loss. This process is also referred to as Online Capacity Expansion (OCE).</div>
<div class="ToDo"><a name="1104203">To expand a unit’s capacity</a></div>
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<div class="NumberedFirst_inner"><a name="1104204">In 3DM2, choose </a><span class="UI-Element">Management &gt;&gt; Maintenance.</span></div>
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<div class="Numbered_inner"><a name="1104205">In the Unit Maintenance table on the Maintenance Page, select the unit </a>you wish to expand by checking the box next to the Unit ID.</div>
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<div class="Numbered_inner"><a name="1104206">Click the </a><span class="UI-Element">Migrate Unit </span>button.</div>
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<div class="Indent"><a name="1104207">The Migrate dialog box appears, listing the drives which can be added to </a>the unit.</div>
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<div class="Numbered_inner"><a name="1104208">Select the drives(s) you wish to add to the unit by checking the Port ID </a>box next to each one.</div>
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<div class="Numbered_inner"><a name="1112911">If desired or necessary, select the appropriate RAID level.</a></div>
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<div class="Numbered_inner"><a name="1104209">Click </a><span class="UI-Element">OK</span>.</div>
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<div class="Indent"><a name="1107573">The Maintenance page updates to show the newly reconfigured unit. The </a>Status column title indicates that Migration is in progress.</div>
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<div class="Numbered_inner"><a name="2172813">If you booted from the unit that is being migrated, when migration is </a>complete, reboot your system. Then turn to Step 4 under <a href="Config_Units.6.20.html#1112868">Informing the Operating System of Changed Configuration</a>.</div>
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<div class="Numbered_inner"><a name="1119590">After the migration is complete, inform the operating system of the </a>change, as described under <a href="Config_Units.6.20.html#1112868">Informing the Operating System of Changed Configuration</a>. </div>
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<div class="Indent"><a name="1891342">You can check the status of the migration on the Maintenance page.</a></div>
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<dt>Related Topics</dt>
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<div class="RelatedTopic"><a href="Config_Units.6.17.html#1104694" name="2407584">RAID Level Migration (RLM) Overview</a></div>
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<div class="RelatedTopic"><a href="Config_Units.6.16.html#2055961" name="2407588">Changing An Existing Configuration by Migrating</a></div>
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<div class="RelatedTopic"><a href="Config_Units.6.18.html#1432690" name="2407592">Changing RAID Level</a></div>
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<div class="RelatedTopic"><a href="Config_Units.6.20.html#1112868" name="2407596">Informing the Operating System of Changed Configuration</a></div>
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